172191390 has 96 divisors (see below), whose sum is σ = 492627744. Its totient is φ = 38384640.

The previous prime is 172191379. The next prime is 172191443. The reversal of 172191390 is 93191271.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 58842 + ... + 61698.

It is an arithmetic number, because the mean of its divisors is an integer number (5131539).

Almost surely, 2^172191390 is an apocalyptic number.

172191390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 172191390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (246313872).

172191390 is an abundant number, since it is smaller than the sum of its proper divisors (320436354).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172191390 is a wasteful number, since it uses less digits than its factorization.

172191390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2922 (or 2915 counting only the distinct ones).

The product of its (nonzero) digits is 3402, while the sum is 33.

The square root of 172191390 is about 13122.1716952645. The cubic root of 172191390 is about 556.3359747596.

The spelling of 172191390 in words is "one hundred seventy-two million, one hundred ninety-one thousand, three hundred ninety".